﻿
using System;
using System.IO;
using System.Text.RegularExpressions;

namespace VOL.Core.Utilities
{
  /// <summary>
  /// PathFormater 的摘要说明
  /// </summary>
  public static class PathFormatter
  {
    public static string Format(string originFileName, string pathFormat)
    {
      if (String.IsNullOrWhiteSpace(pathFormat))
      {
        pathFormat = "{filename}{rand:6}";
      }

      var invalidPattern = new Regex(@"[\\\/\:\*\?\042\<\>\|]");
      originFileName = invalidPattern.Replace(originFileName, "");

      string extension = Path.GetExtension(originFileName);
      string filename = Path.GetFileNameWithoutExtension(originFileName);

      pathFormat = pathFormat.Replace("{filename}", filename);
      pathFormat = new Regex(@"\{rand(\:?)(\d+)\}", RegexOptions.Compiled).Replace(pathFormat, new MatchEvaluator(delegate(Match match)
      {
        var digit = 6;
        if (match.Groups.Count > 2)
        {
          digit = Convert.ToInt32(match.Groups[2].Value);
        }
        var rand = new Random();
        return rand.Next((int)Math.Pow(10, digit), (int)Math.Pow(10, digit + 1)).ToString();
      }));

      pathFormat = pathFormat.Replace("{time}", DateTime.Now.Ticks.ToString());
      pathFormat = pathFormat.Replace("{yyyy}", DateTime.Now.Year.ToString());
      pathFormat = pathFormat.Replace("{yy}", (DateTime.Now.Year % 100).ToString("D2"));
      pathFormat = pathFormat.Replace("{mm}", DateTime.Now.Month.ToString("D2"));
      pathFormat = pathFormat.Replace("{dd}", DateTime.Now.Day.ToString("D2"));
      pathFormat = pathFormat.Replace("{hh}", DateTime.Now.Hour.ToString("D2"));
      pathFormat = pathFormat.Replace("{ii}", DateTime.Now.Minute.ToString("D2"));
      pathFormat = pathFormat.Replace("{ss}", DateTime.Now.Second.ToString("D2"));

      return pathFormat + extension;
    }
  }
}